fs = fifo_segment_get_segment (&em->segment_main, fs_index);
s->rx_fifo = fifo_segment_alloc_fifo_w_offset (fs, rxf_offset);
s->tx_fifo = fifo_segment_alloc_fifo_w_offset (fs, txf_offset);
fs = fifo_segment_get_segment (&em->segment_main, fs_index);
s->rx_fifo = fifo_segment_alloc_fifo_w_offset (fs, rxf_offset);
s->tx_fifo = fifo_segment_alloc_fifo_w_offset (fs, txf_offset);